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How to use two logical operation inside a if condition?

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Asim Ismail
Asim Ismail 2017-8-19
评论： Asim Ismail 2017-8-19
I have three statements in a if condition and they are executed when the logical operations are true. For example I have two variables a and b, and their values are:
a=7;
b=5;
if a=7 && b=a || b<a
do something
end
Can someone please tell me what is the correct way to perform second operation (b=a | | b<a) first, and then do && operation between the result and the first statement (a=7)?

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采纳的回答

Star Strider
Star Strider 2017-8-19
编辑：Star Strider 2017-8-19
They are evaluated left-to right. See the documentation on Logical Operators: Short-Circuit && || (link) for a full discussion.
When in doubt, experiment to understand how the logic works:
a=7;
b=5;
L1 = a==7 && b==a || b<a
a=5;
b=5;
L2 = (b==a || b<a) && a==7
a=6;
b=5;
L3 = (b==a || b<a) && a==7
... and others as you want to study them.
Also, you need to use ‘double equals’ here:
if a==7 && b==a || b<a

更多回答（1 个）

Image Analyst
Image Analyst 2017-8-19
Like this:
a=7;
b=5;
if a==7 && (b==a || b<a)
% do something
end
Make sure you use double equals for comparison, rather than single equals which does assignment.
Since a has to equal 7, the if won't be true unless b is equal to or less than 7. So you could do this
if a == 7 && b <= 7
which is the same thing.

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